/* eslint-disable */
const {resolve} = require("path");
HtmlWebpackPlugin = require("html-webpack-plugin");
MiniCssExtractPlugin = require("mini-css-extract-plugin");
OptimizeCssAssetsWebpackPlugin = require("optimize-css-assets-webpack-plugin");

process.env.NODE_ENV = "development"//修改node.js环境变量

const commonCssLoader = [
    {
        loader: MiniCssExtractPlugin.loader,
        options: {
            publicPath:'../'
        }
    },
    "css-loader",
    {
        //需要再package.json中定义browserslist
        loader: "postcss-loader",
        options: {
            ident: "postcss",
            plugins: () => [
                require("postcss-preset-env")()
            ]
        }
    }
]
module.exports = {
    entry: "./src/index.js",
    output: {
        filename: "js/built.js",
        path: resolve(__dirname, "build")
    },
    module: {
        rules: [
            {
                test: /\.css$/,
                use: [...commonCssLoader]
            },
            {
                test: /\.less$/,
                use: [...commonCssLoader, "less-loader"]
            },
            {
                //需要再package.json中配置eslintConfig -->airbnb
                test: /\.js$/,
                exclude: /node_modules/,
                //优先执行
                enforce: "pre",
                loader: "eslint-loader",
                options: {
                    fix: true
                }
            },
            {
                test: /\.js$/,
                exclude: /node_modules/,
                loader: "babel-loader",
                options: {
                    presets: [
                        [
                            "@babel/preset-env",
                            {
                                useBuiltIns: "usage",
                                corejs: {version: 3},
                                //指定兼容性做到哪个浏览器的哪个版本
                                targets: {
                                    chrome: 60
                                }
                            }
                        ]
                    ]
                }
            },
            {
                test: /\.(jpg|png|gif)$/,
                loader: "url-loader",
                options: {
                    limit: 8 * 1024,
                    name: "[hash:10].[ext]",
                    outputPath: "img",
                    esModule: false
                }
            },
            {
                test: /\.html$/,
                loader: "html-loader"
            },
            {
                exclude: /\.(js|css|less|html|jpg|png|gif)$/,
                loader: "file-loader",
                options: {
                    outputPath: "media"
                }
            }
        ]
    },
    plugins: [
        new HtmlWebpackPlugin({
            template: "./src/index.html",
            minify: {
                collapseWhitespace: true,
                removeComments: true
            }
        }),
        new MiniCssExtractPlugin({
            filename: "css/index.css"
        }),
        new OptimizeCssAssetsWebpackPlugin()
    ],
    mode: "production"
}
